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        <a href="simvoc-module.html">Package&nbsp;simvoc</a> ::
        <a href="simvoc.core-module.html">Package&nbsp;core</a> ::
        <a href="simvoc.core.db_output-module.html">Module&nbsp;db_output</a> ::
        Class&nbsp;DBOutput
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class DBOutput</h1><p class="nomargin-top"><span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput">source&nbsp;code</a></span></p>
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<p>Output handler that writes results directly to a database in sqlite3 
  format. Results are neither filtered nor buffered.</p>

<!-- ==================== INSTANCE METHODS ==================== -->
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="simvoc.core.db_output.DBOutput-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">filename</span>,
        <span class="summary-sig-arg">commit_ivl</span>=<span class="summary-sig-default">500</span>,
        <span class="summary-sig-arg">output</span>=<span class="summary-sig-default">None</span>)</span><br />
      x.__init__(...) initializes x; see x.__class__.__doc__ for signature</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__init__">source&nbsp;code</a></span>
            
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="__commit"></a><span class="summary-sig-name">__commit</span>(<span class="summary-sig-arg">self</span>)</span><br />
      Private method: commits database transactions</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__commit">source&nbsp;code</a></span>
            
          </td>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="__check_commit"></a><span class="summary-sig-name">__check_commit</span>(<span class="summary-sig-arg">self</span>)</span><br />
      Private method: checks to see if the commit interval has been reached
      and commits transactions if necessary</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__check_commit">source&nbsp;code</a></span>
            
          </td>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="simvoc.core.db_output.DBOutput-class.html#__create_table" class="summary-sig-name" onclick="show_private();">__create_table</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">table_name</span>,
        <span class="summary-sig-arg">columns</span>,
        <span class="summary-sig-arg">add_time</span>)</span><br />
      Private method: creates a new table (and commits)</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__create_table">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="simvoc.core.db_output.DBOutput-class.html#__add_column" class="summary-sig-name" onclick="show_private();">__add_column</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">table_name</span>,
        <span class="summary-sig-arg">column_name</span>)</span><br />
      Private method: adds a column to a table.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__add_column">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
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          <td><span class="summary-sig"><a href="simvoc.core.db_output.DBOutput-class.html#__insert" class="summary-sig-name" onclick="show_private();">__insert</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">table_name</span>,
        <span class="summary-sig-arg">columns</span>,
        <span class="summary-sig-arg">data</span>)</span><br />
      Private method: inserts data into a table</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__insert">source&nbsp;code</a></span>
            
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
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          <td><span class="summary-sig"><a href="simvoc.core.db_output.DBOutput-class.html#__add_to_db" class="summary-sig-name" onclick="show_private();">__add_to_db</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">table_name</span>,
        <span class="summary-sig-arg">result</span>)</span><br />
      Private method: adds a result to a table.</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__add_to_db">source&nbsp;code</a></span>
            
          </td>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="simvoc.core.db_output.DBOutput-class.html#handle_append" class="summary-sig-name">handle_append</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">result</span>)</span><br />
      Adds an output result to the database</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.handle_append">source&nbsp;code</a></span>
            
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      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
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          <td><span class="summary-sig"><a href="simvoc.core.db_output.DBOutput-class.html#handle_close" class="summary-sig-name">handle_close</a>(<span class="summary-sig-arg">self</span>)</span><br />
      Commits final transactions and closes the database connection</td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.handle_close">source&nbsp;code</a></span>
            
          </td>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a href="simvoc.core.kernel.Output-class.html#append" class="summary-sig-name">append</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">result</span>)</span><br />
      Appends a result to the output destination, then passes the result to
      a downstream Output handler, if any.
      <em>(Inherited from <a href="simvoc.core.kernel.Output-class.html">simvoc.core.kernel.Output</a>)</em></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.kernel-pysrc.html#Output.append">source&nbsp;code</a></span>
            
          </td>
        </tr>
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    </td>
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    <td width="15%" align="right" valign="top" class="summary">
      <span class="summary-type">&nbsp;</span>
    </td><td class="summary">
      <table width="100%" cellpadding="0" cellspacing="0" border="0">
        <tr>
          <td><span class="summary-sig"><a name="close"></a><span class="summary-sig-name">close</span>(<span class="summary-sig-arg">self</span>)</span><br />
      Closes all output handlers in the downstream portion of the pipeline,
      including the output handler on which this method is invoked (if 
      applicable).
      <em>(Inherited from <a href="simvoc.core.kernel.Output-class.html">simvoc.core.kernel.Output</a>)</em></td>
          <td align="right" valign="top">
            <span class="codelink"><a href="simvoc.core.kernel-pysrc.html#Output.close">source&nbsp;code</a></span>
            
          </td>
        </tr>
      </table>
      
    </td>
  </tr>
  <tr>
    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
      <code>__delattr__</code>,
      <code>__format__</code>,
      <code>__getattribute__</code>,
      <code>__hash__</code>,
      <code>__new__</code>,
      <code>__reduce__</code>,
      <code>__reduce_ex__</code>,
      <code>__repr__</code>,
      <code>__setattr__</code>,
      <code>__sizeof__</code>,
      <code>__str__</code>,
      <code>__subclasshook__</code>
      </p>
    </td>
  </tr>
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<!-- ==================== PROPERTIES ==================== -->
<a name="section-Properties"></a>
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        <td align="left"><span class="table-header">Properties</span></td>
        <td align="right" valign="top"
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         class="privatelink" onclick="toggle_private();"
         >hide private</a>]</span></td>
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    <td colspan="2" class="summary">
    <p class="indent-wrapped-lines"><b>Inherited from <code>object</code></b>:
      <code>__class__</code>
      </p>
    </td>
  </tr>
</table>
<!-- ==================== METHOD DETAILS ==================== -->
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        <td align="left"><span class="table-header">Method Details</span></td>
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         class="privatelink" onclick="toggle_private();"
         >hide private</a>]</span></td>
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<a name="__init__"></a>
<div>
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       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">filename</span>,
        <span class="sig-arg">commit_ivl</span>=<span class="sig-default">500</span>,
        <span class="sig-arg">output</span>=<span class="sig-default">None</span>)</span>
    <br /><em class="fname">(Constructor)</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__init__">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>x.__init__(...) initializes x; see x.__class__.__doc__ for 
  signature</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>filename</code></strong> (str) - Name of sqlite3 database to create. If this file is found in the 
          filesystem, it will be deleted first.</li>
        <li><strong class="pname"><code>commit_ivl</code></strong> (int) - Frequency with which database writes should be committed to the 
          database, in units of result counts</li>
        <li><strong class="pname"><code>output</code></strong> - Optional kernel.Output (or subclass) instance to which results 
          will be piped after writing to the database</li>
    </ul></dd>
    <dt>Overrides:
        object.__init__
    </dt>
  </dl>
</td></tr></table>
</div>
<a name="__create_table"></a>
<div class="private">
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       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">__create_table</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">table_name</span>,
        <span class="sig-arg">columns</span>,
        <span class="sig-arg">add_time</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__create_table">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Private method: creates a new table (and commits)</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>table_name</code></strong> (str) - Name of the table to create (must be unique)</li>
        <li><strong class="pname"><code>columns</code></strong> - Sequence of column names (strings) to add to the table; each 
          table must have at least one column</li>
        <li><strong class="pname"><code>add_time</code></strong> (bool) - Flag indicating whether or not the time column should be added to
          the table</li>
    </ul></dd>
  </dl>
</td></tr></table>
</div>
<a name="__add_column"></a>
<div class="private">
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">__add_column</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">table_name</span>,
        <span class="sig-arg">column_name</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__add_column">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Private method: adds a column to a table. The column name must be 
  unique, and the table must already exist.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>table_name</code></strong> (str) - Table name</li>
        <li><strong class="pname"><code>column_name</code></strong> (str) - Name of the column to add</li>
    </ul></dd>
  </dl>
</td></tr></table>
</div>
<a name="__insert"></a>
<div class="private">
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">__insert</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">table_name</span>,
        <span class="sig-arg">columns</span>,
        <span class="sig-arg">data</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__insert">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Private method: inserts data into a table</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>table_name</code></strong> (str) - Name of the table into which to insert</li>
        <li><strong class="pname"><code>columns</code></strong> - Sequence of column names (str) into which data values will be 
          inserted</li>
        <li><strong class="pname"><code>data</code></strong> - Sequence of data values (sqlite3-supported types) IN THE SAME 
          ORDER AS THE COLUMN NAMES</li>
    </ul></dd>
  </dl>
</td></tr></table>
</div>
<a name="__add_to_db"></a>
<div class="private">
<table class="details" border="1" cellpadding="3"
       cellspacing="0" width="100%" bgcolor="white">
<tr><td>
  <table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr valign="top"><td>
  <h3 class="epydoc"><span class="sig"><span class="sig-name">__add_to_db</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">table_name</span>,
        <span class="sig-arg">result</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.__add_to_db">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Private method: adds a result to a table. Result objects are unpacked 
  to populate table columns using result field names. If the table name is 
  not found in the database, then a new table will be created. Similarly, 
  if a result field name does not match a column name in the table, then a 
  new column will be inserted.</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>table_name</code></strong> (str) - Name of the table in which to store data</li>
        <li><strong class="pname"><code>result</code></strong> - Result object to unpack</li>
    </ul></dd>
  </dl>
</td></tr></table>
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<a name="handle_append"></a>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">handle_append</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">result</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.handle_append">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Adds an output result to the database</p>
  <dl class="fields">
    <dt>Parameters:</dt>
    <dd><ul class="nomargin-top">
        <li><strong class="pname"><code>result</code></strong> - Result object to unpack into the database</li>
    </ul></dd>
    <dt>Overrides:
        <a href="simvoc.core.kernel.Output-class.html#handle_append">kernel.Output.handle_append</a>
    </dt>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">handle_close</span>(<span class="sig-arg">self</span>)</span>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="simvoc.core.db_output-pysrc.html#DBOutput.handle_close">source&nbsp;code</a></span>&nbsp;
    </td>
  </tr></table>
  
  <p>Commits final transactions and closes the database connection</p>
  <dl class="fields">
    <dt>Overrides:
        <a href="simvoc.core.kernel.Output-class.html#handle_close">kernel.Output.handle_close</a>
    </dt>
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